When it comes to trading and investing everyone has their own set of rules they obey. I made a list with my rules and that made me curious, what set of rules do you use?

My own rules:
- Never invest in a program that "makes money for you."
- Never buy at a sudden rise in value but wait untill the market is stabilized.
- Never have more than 20% of portfolio in one coin.
- Don't trust anyone!
- Check the sources of news.
- Know the coin! Active team? Goals? Coin supply - market cap? exchanges? ...